**Awakening**: Qin Mo, captain of the criminal investigation squad, is killed in an explosion while investigating the serial murders known as the “Rainy Night Butcher” case. He unexpectedly gains the ability to “rewind death,” returning to 72 hours before the crime each time he dies.
- **The First Case**: By reliving his deaths and gathering clues, Qin Mo discovers that the killer is Zhou Mingyuan, a seemingly refined university professor whose childhood trauma has left him bent on revenge.
- **Key Ally**: Forensic expert Lu Li becomes Qin Mo's trusted ally, and the two develop a special bond of trust as they solve the case.
- **The Price of the Truth**: Qin Mo ultimately sets a trap that exposes Zhou Mingyuan, but has to suffer severe injuries to secure the evidence. Once the case is over, his ability resets, and he enters the cycle of a new case.
- **Hidden Clue**: Qin Mo discovers a mysterious “∞” symbol behind every case, suggesting that these seemingly unrelated cases may be connected in ways he can't yet see.
